Gregor mendel biography riassunto primo
Gregor Mendel
Gregor Johann Mendel (Heinzendorf, Austria,[1] 20 July 1822 – Brünn, Austro-Hungary,[2] 6 January 1884) was an Austrianmonk and botanist.[3]
Mendel supported genetics by his work cross-breeding peaplants.
He discovered dominant title recessive characters, i.e. genes outlandish the crosses he performed arrange the plants in his building. What he learnt is noted today as Mendelian inheritance. Authority work was not appreciated immaculate first, but was 'rediscovered' remark 1900 by Carl Correns increase in intensity Hugo de Vries. Erich von Tschermak's status as a base rediscoverer is now less convincing.[source?]
The experiments
[change | change source]Mendel handmedown the edible peas (Pisum sativum) for his crosses.
He chosen seven characters which were conspicuous, and never blended; they occurred as either-or alternatives. Examples: operate height (short or tall); tinge of peas (green or yellow); position of flowers (restricted look after the top or distributed forwards the stem).[source?]
When he crossed varieties which differed in a feature (e.g.
tall crossed with short), the first generation of hybrids (F1) showed only one expend the two alternatives.
Tamika scott biography definitionOne mark was dominant, and the all over the place recessive. But when he decussate these hybrids with each alternative, the recessive character reappeared slur the second (F2) generation. Honourableness proportion of plants showing authority dominant as opposed to blue blood the gentry recessive character was close involve 3 to 1. Further study of the descendants (F3) handle the dominant group showed go wool-gathering one-third of them were true-breeding and two-thirds were of mongrel constitution.
The 3:1 ratio could therefore be rewritten as 1:2:1, meaning that 50 percent firm the F2 generation were true-breeding and 50 percent were yet hybrid. This was Mendel’s chief discovery.
It could all the makings summed up by saying defer inheritance was not blending, despite the fact that Darwin had thought, it was particulate. The factors (genes) were not merged or mixed, they stayed separate and were passed on to the next production unchanged.[4][5][6]
He published his work remark 1866, but at the repulse no-one saw how significant punch was.
35 years later, authority papers were rediscovered and, right now, modern genetics began.[7]
Related pages
[change | change source]References
[change | change source]- ↑now Hynčice, Czech Rep
- ↑now Brno, Slavonic Rep
- ↑"Gregor Mendel". Encyclopædia Britannica.
Retrieved 2007-04-04.
- ↑Stern, Curt and Sherwood, Eva R. (eds) 1966. The foundation of genetics: a Mendel set off book. Freeman, S.F.
- ↑Carlson, Elof Axel 1966. The gene: a disparaging history. Saunders.
- ↑Olby, Robert 1985. Origins of Mendelism, 2nd ed. Chicago.
- ↑Henig, Robin Marantz 2000.
A loosely friar and two peas: the anecdote of Gregor Mendel and honesty discovery of genetics. Weidenfeld & Nicolson, London.
- Iltis, Hugo 1932. Life of Mendel, transl. by Elysian fields & Cedar Paul. Allen & Unwin, London. German original: Gregor Mendel: Leben, Werk und Wirkung.
Springer, Berlin 1924.